[PATCH 2/2] powerpc: export memory encryption helper functions

From: Arnd Bergmann <arnd@arndb.de>

The set_memory_encrypted/set_memory_decrypted functions are exported
on x86 and arm64 but not on powerpc, which leads to a new build failure
because they are now used in a loadable module:

ERROR: modpost: "set_memory_encrypted" [drivers/dma-buf/heaps/system_heap.ko] undefined!
ERROR: modpost: "set_memory_decrypted" [drivers/dma-buf/heaps/system_heap.ko] undefined!

Export these the same way we do on the other architectures.

Fixes: fd55edff8a0a ("dma-buf: heaps: system: Turn the heap into a module")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/powerpc/platforms/pseries/svm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/svm.c b/arch/powerpc/platforms/pseries/svm.c
index 384c9dc1899a..ab8f8c722741 100644
--- a/arch/powerpc/platforms/pseries/svm.c
+++ b/arch/powerpc/platforms/pseries/svm.c

@@ -6,6 +6,7 @@
  * Author: Anshuman Khandual <khandual@linux.vnet.ibm.com>
  */
 
+#include <linux/export.h>
 #include <linux/mm.h>
 #include <linux/memblock.h>
 #include <linux/mem_encrypt.h>

@@ -50,6 +51,7 @@ int set_memory_encrypted(unsigned long addr, int numpages)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(set_memory_encrypted);
 
 int set_memory_decrypted(unsigned long addr, int numpages)
 {

@@ -63,6 +65,7 @@ int set_memory_decrypted(unsigned long addr, int numpages)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(set_memory_decrypted);
 
 /* There's one dispatch log per CPU. */
 #define NR_DTL_PAGE (DISPATCH_LOG_BYTES * CONFIG_NR_CPUS / PAGE_SIZE)

-- 
2.39.5

Hi Arnd,

Le 26/05/2026 à 12:20, Arnd Bergmann a écrit :

From: Arnd Bergmann <arnd@arndb.de>

The set_memory_encrypted/set_memory_decrypted functions are exported
on x86 and arm64 but not on powerpc, which leads to a new build failure
because they are now used in a loadable module:

ERROR: modpost: "set_memory_encrypted" [drivers/dma-buf/heaps/system_heap.ko] undefined!
ERROR: modpost: "set_memory_decrypted" [drivers/dma-buf/heaps/system_heap.ko] undefined!

Export these the same way we do on the other architectures.

The same fix was rejected already, see https://lore.kernel.org/all/ahPqbfH54R3JJyaV@infradead.org/

Christophe